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android - 使用 Jetpack Navigation 移动到 MainActivity

问题描述

如何从 MainActivity 中的 SettingsListFragment 移动？

<fragment
        android:id="@+id/settings_list_fragment"
        android:name="com.mandarine.targetList.features.settings.SettingsListFragment"
        android:label="@string/settings"
        tools:layout="@layout/fragment_settings_list">
    </fragment>

因为在我的导航图中我没有来自 MainActivity 的屏幕。我在一项活动中有整个导航，你可以检查代码

class MainActivity : AppCompatActivity(), MainActivityViewContract {

    private lateinit var auth: FirebaseAuth
    private lateinit var mAuthStateListener: FirebaseAuth.AuthStateListener
    private val presenter = MainActivityPresenter(contract = this)
    private lateinit var appBarConfiguration: AppBarConfiguration

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)
        signIn()
        setupViews()
    }

    override fun onSupportNavigateUp(): Boolean {
        return findNavController(R.id.nav_host_fragment).navigateUp(appBarConfiguration)
    }

    override fun onResume() {
        super.onResume()
        auth.addAuthStateListener(mAuthStateListener)
    }

    override fun onPause() {
        super.onPause()
        auth.removeAuthStateListener(mAuthStateListener)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        presenter.onActivityResult(requestCode, resultCode)
    }

    override fun cancelSignIn() {
        finish()
    }

    private fun setupViews() {
        val host: NavHostFragment = supportFragmentManager
            .findFragmentById(R.id.nav_host_fragment) as NavHostFragment? ?: return

        val navController = host.navController
        appBarConfiguration = AppBarConfiguration(navController.graph)

        val drawerLayout: DrawerLayout? = findViewById(R.id.drawer_layout)
        appBarConfiguration = AppBarConfiguration(
            setOf(R.id.target_list, R.id.settings_list_fragment, R.id.calendar_fragment),
            drawerLayout
        )
        setupActionBar(navController, appBarConfiguration)
        setupNavigationMenu(navController)
        setupBottomNavMenu(navController)
    }

    private fun setupNavigationMenu(navController: NavController) {
        val sideNavView = findViewById<NavigationView>(R.id.nav_view)
        sideNavView?.setupWithNavController(navController)
    }

    private fun setupActionBar(
        navController: NavController,
        appBarConfig: AppBarConfiguration
    ) {
        setupActionBarWithNavController(navController, appBarConfig)
    }

    private fun setupBottomNavMenu(navController: NavController) {
        val bottomNavigationView = findViewById<BottomNavigationView>(R.id.bottom_navigation_view)
        bottomNavigationView?.setupWithNavController(navController)
    }

    private fun signIn() {
        auth = FirebaseAuth.getInstance()
        mAuthStateListener = FirebaseAuth.AuthStateListener { firebaseAuth ->
            presenter.signIn(activity = this, user = firebaseAuth.currentUser)
        }
    }
}

标签： androidkotlinandroid-jetpackandroid-jetpack-navigation

解决方案

您可以<activity../>在导航图中添加标签并将其设置为操作中的目的地。

<activity
  android:id="@+id/main_activity_destination"
  android:name="com.mandarine.your.package.path.here.MainActivity" />

然后，您可以调用navController.navigate(R.id.main_activity_destination)

或者，如果您想更好地控制导航图中的流程，您可以创建一个操作：

<action
  android:id="@+id/go_to_main_activity"
  app:clearTask="true"
  app:destination="@+id/main_activity_destination"
  app:launchSingleTop="true"
  app:popUpTo="@id/main_activity_destination" />

然后，您可以调用navController.navigate(R.id.go_to_main_activity)

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